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(No Model.) I J. K. BABUOCK & J. P. CHAMPION.

TUBE EXPANDER. No. 375,248. Patented Dec. 20, 1887.

UNITED STATES PATENT @FEICE.

JABEZ K. BABOOCK AND JOSIAH P. CHAMPION, OF PHELPS, NEW YORK.

TUBE-EXPANDER- I SPECIFICATION forming part of Letters Patent No, 375,248, dated December 20, 1887.

Application filed September 23, 1886. Serial No. 214,371.

To all whom it may concern:

Be it known that we, JABEZ K. BABOOOK and JOSIAH P. CHAMPION, both citizens of the United States, residing at Phelps, inthe county of Ontario and State of New York, have invented a certain new and useful Improvement in Devices for Attaching Boiler and other Flues; and we do hereby declare that the following is a full, clear, and exact description of the same,.reference being had to the drawings accompanying this application.

Our improvement relates to means for attaching boiler-fines to the sheets or heads, or for other similar purposes. The method in common use is to expand the end of the flue in the hole prepared for it, then break or turn over its edge, and then pound it down. In the act of turning down the edge it is frequently cracked or broken, and in clinching it down an imperfect joint is produced.

In our invention we insert a conical plug in the end of the flue, said plug projecting outward beyond the end of the line. Then we insert a bolt in a hole in the plug, and then at tach a swivel-guide that turns loosely on the bolt. The punch is inserted loosely through a hole in the outer end of the guide, and, together with the guide, is moved round gradually in a circle as the work progresses, all as hereinafter described.

In the drawings, Figure 1 is an end elevation showing the attachment in place for fastening a flue. Fig. 2 is a longitudinal section of the same in line at w of Fig. 1. v A indicates the head of a steam-boiler, and B one of the fines which are to be attached in place. After the flue has been placed in the hole where it is to-be attached,an ordinary expander may be inserted to expand the end to fill the hole.

Our improvement is as follows:

C is a conical or tapering plug, which is inserted in the open end of the flue, said plug (No model.)

projecting outward some distance beyond the end of the flue. The plug is provided witha central screw hole, a.

D is a headed bolt that screws from the outside into this hole.

E is a bar, which we denominate the swivel'guide. It has a round hole at one end, which fits around the bolt and allows the swivel-guide to turn freely. In the other end is a hole, 0, in which rests the punch G, used to punch the metal down. The punch stands in such a position as to keep its end on the end of the flue which is to be-punched down and so as to punch it back against the sides of the plug which projects from the end of the flue. A hammer is used to drive the punch.

The operation is as follows: The plug having been inserted and the swivel'guide attached to the bolt so as to turn freely, the punch is passed through the holecand the swivel-guide is turned slowly around as fast as the punching progresses. The metal is not only riveted down on the plate, but is forced up against the sides of the plug, which makes a smooth finish on the inside. In this matter more accurate work can be done and a better joint produced than by the old process.

Having described our invention,weclaim In an attachment for riveting boiler or other flues, the combination. of the tapering plug inserted in the end of the flue, the bolt attached to the plug, and the swiveled guide turning on the bolt and provided with a hole to receive the punch, as herein shown and described.

In witness whereof we have hereunto signed our names in the presence of two subscribing witnesses.

JABEZ K. BABGOCK. JOSIAH r. CHAMPION.

Vitn esses:

JosEPH SPEER, JOHN T. Gmronn. 

